CN104801422B - Efficient dust removal system for coal-fired flue gas - Google Patents
Efficient dust removal system for coal-fired flue gas Download PDFInfo
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- CN104801422B CN104801422B CN201510174377.3A CN201510174377A CN104801422B CN 104801422 B CN104801422 B CN 104801422B CN 201510174377 A CN201510174377 A CN 201510174377A CN 104801422 B CN104801422 B CN 104801422B
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Abstract
The invention discloses an efficient dust removal system for coal-fired flue gas. A flue gas delivery pipeline comprises a gas inlet pipeline, a throat and a flow equalizing pipeline, wherein the tail end of the gas inlet pipeline is bent downwards to form a blunt body, and the downward pipeline wall of the pipeline section, connected with the flow equalizing pipeline, at the tail end of the gas inlet pipeline bulges downwards to form a dust collecting tank; a plurality of atomizing and spraying devices are evenly arranged in the gas inlet pipeline. A plurality of branch pipelines are arranged on the flow equalizing pipeline to form gas delivery pipelines, the tail end of each gas delivery pipeline is communicated with an inner cavity of a cyclone separator, and a spraying water ring is arranged in the cyclone separator; the dust collecting tank is arranged below the cyclone separator, and a dust removal port at the lower end of the cyclone separator extends into the dust collecting tank. A cathode line for generating electrons is arranged in each gas delivery pipeline, and an anode line is arranged on the inner wall surface of the cyclone separator. The system can remove dust in the coal-fired flue gas more efficiently through three-stage dust removal. Ash cannot accumulate on the surface of system equipment, and stable and efficient running of the equipment is guaranteed.
Description
Technical field
The present invention relates to Air Pollution Control treatment technology, more particularly, to a kind of coal-fired flue-gas high-efficiency dust removal system, belong to
Environmental technology field.
Background technology
The energy resource structure of China determine China future considerable time in still can be using coal as main energy sources.Coal fired power plant
The flue gas of boiler and Industrial Boiler fume emission is fine particle is atmospheric pollution main fixed discharge source although nowadays most of
Coal-fired power station boiler and Industrial Boiler have employed cleaner and measure, but are limited by equipment limit and run improper former
Cause, in flue gas, the removal efficiency of fine particle is low, and in flue gas, the total amount of the fine particle such as fine dust, acid mist often reaches 100mg/
m3Left and right, and fine particulates discharge severe overweight, the fine particle total amount of discharge is huge, these fine particle long-term suspension
It is difficult in atmosphere settle, form haze.
Increasingly stricter with what the raising of living environment quality and environmental protection standard required to health with people, and country
Environmental conservation is increasingly paid attention to, so3, hydrargyrum, fine flue dust, aerosol contaminants, nitrogen oxides etc. have reduction of discharging to require, simultaneously
Country it is also proposed requirements at the higher level to coal steam-electric plant smoke discharge standard, up-to-date " fossil-fuel power plant atmospheric pollutant emission standard (2012
On January 1, in implements) " part specific requirement:
| Pollutant project is suitable for condition | Soot fraction |
| Limit value (mg/nm3) | 30(key area 20) |
Nowadays the cleaner of coal-burning power plant is varied, has dry electric precipitation device, wet electrical dust precipitator, bag-type dust
Device etc., dedusting method is also not quite similar, but efficiency of dust collection is not still high.Trace it to its cause, mainly dust is not thorough, Yi Jirong
Easily form multiple airborne dust.
Presently, it is recognized that administer the coal-fired plant flue gas maximally efficient equipment of discharge be wet electrical dust precipitator (referred to as
Wesp), the discharge energy effective control to pm0.1-pm10 dust for this equipment, also include the cloud and mist to sour gas, heavy metal and
The effective control of the discharges such as Organic substance.
The dust removal mechanism of wet electrical dust precipitator is consistent with the dust removal mechanism of dry electric precipitation device, is all to be made by electrostatic
With making adsorbing powder dust, difference is different in the mode collecting dust, and the former is to rinse collecting plate by water to reach removing laying dust
Purpose, the latter is to make dust depart from collecting plate by hammering rapping, so being also easy to produce secondary in dry electric precipitation device dust removal process
Airborne dust, and wet electrical dust precipitator will not produce, high to the collection rate of respirable dust, removal efficiency is also high, can be with adsorbed gas
Body, removes so3The harmful substances such as the heavy metal in sour gas and flue gas.
In prior art, the patent of the efficient cyclone electric dust collector of Liang Lan et al., can using electric field force and centrifugal force
To remove the granule of certain particle size range, greatly reduce the discharge capacity of discharge flue dust；A kind of wet-esp of Ge Jielong et al.
Patent, dust deviate from by the effect using electric field force.Although above-mentioned various prior art has the spy of oneself on flue gas ash removal
Point and effect, but still highly efficient to flue gas ash removal at present, and dedusting scope more extensively has strong current demand.
Content of the invention
For deficiencies of the prior art, it is an object of the invention to provide a kind of highly efficient coal-fired cigarette of dedusting
Gas dust pelletizing system.
The technical scheme is that and be achieved in that:
A kind of coal-fired flue-gas high-efficiency dust removal system, including smoke conveying duct, described smoke conveying duct is by head and the tail successively
Connected admission line, throat and equal flow tube road are constituted, and admission line is downward-sloping with airflow direction, and equal flow tube road is with air-flow side
To being inclined upwardly, admission line end upper tube wall is bent to form downwards makes to flow the bluff body that flue gas streams, admission line end
Tube wall under that segment pipe being connected with equal flow tube road is held to swell downwards to be formed and admission line and equal flow tube road phase in pipeline
Logical dust pond；Bluff body lower end is located on dust pond and constitutes described throat and dust water face between；In admission line
It is uniformly provided with some atomizing sprayers；
Some laterals are provided with equal flow tube road and constitute gas pipeline, each gas pipeline end and cyclone separator
Inner chamber tangentially connects, and cyclone separator upper end is air outlet, and lower end is to be located at air outlet and gas transmission in dust removal port, cyclone separator
It is provided between pipeline connection position for being washed away to inwall to collect the spray water ring of dust；It is provided with below cyclone separator
Dust pond, cyclone separator lower end dust removal port stretches in dust pond；It is provided with the moon for producing electronics in each gas pipeline
Polar curve, when ash-laden gas flows through gas pipeline, is ionized by cathode line and makes dust negatively charged, be provided with cyclone separator internal face
Anode line；The outside wall surface insulation of cyclone separator.
The downward-sloping angle of described admission line is 5-10 °, bluff body with come to flow flue gas angle be 50-60 °, bluff body lower end
It is about 2/3rds of admission line diameter away from dust pond water surface elevation.
It is spaced apart 100mm-200mm, the atomized water particle diameter that its shower nozzle sprays is 50- between described atomizing sprayer
100um.
Described admission line air inlet is horn mouth.
All dust Chi Cebi are provided with the water inlet pipe with valve and outlet pipe.
Dust pond upper end below cyclone separator according to horizontal direction 10-20 upwardsoAngle close up, this closing in is slightly
More than cyclone separator dust removal port.
All gas pipelines be arranged in parallel, and parallel with the direction that flue gas initially enters the system.
Compared to existing technology, the invention has the following beneficial effects:
Compared with conventional wet type electric cleaner, the dedusting stage divides three-level to the present invention, different to thickness dust collection mode；Just
Level dedusting, catches first to the bulky grain in fine dust, and will not form accumulation in pipeline；Primary dust removing, to part cigarette
Dirt catches removing again, and the water surface is stablized effective to the seizure of dust；Two-stage dust removal, in the collective effect of electric field force and centrifugal force
Under, dust is firmly captured cyclone separator wall, in the presence of moisture film, flows into dust pond.Removed by above-mentioned three-level
Dirt, can more efficiently remove the dust in coal-fired flue-gas.
The system equipment surface not dust stratification it is ensured that stable equipment operation is efficient.Using this device, de- coal-fired flue-gas are processed,
Can ensure that discharging flue dust is down to 10mg/nm3Hereinafter, this index reaches national environmental standard.
Brief description
Fig. 1 is present configuration schematic diagram.
Fig. 2 is cyclone separator profile.
Wherein: 1- admission line；2- atomizing sprayer；3- dust removal port；4- bluff body；5- dust pond；6- shower water main pipe；
7- water inlet pipe；8- outlet pipe；9- gas pipeline；10- cathode line；11- throat；12- cyclone separator；13- air inlet；14- receives
Mouthful；15- water；16- anode line；17- sprays water ring；18- air outlet；19- valve；20- equal flow tube road.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Referring to Fig. 1 and Fig. 2, can be seen that coal-fired flue-gas high-efficiency dust removal system of the present invention from figure, including flue gas delivery pipe
Road, described smoke conveying duct is made up of end to end admission line 1 successively, throat 11 and equal flow tube road 20, admission line 1
Downward-sloping with airflow direction, equal flow tube road 20 is inclined upwardly with airflow direction, the downward bent of admission line 1 end upper tube wall
Become to make to flow the bluff body 4 that flue gas streams, under that segment pipe that admission line 1 end is connected with equal flow tube road 20, tube wall is downward
Protuberance is to form the dust pond 5 communicating with admission line and equal flow tube road in pipeline.Bluff body 4 lower end is located on dust pond 5
And constitute described throat 11 and dust water face between.It is uniformly provided with some atomizing sprayers 2 in admission line 1, atomization
It is spaced apart 100mm-200mm, the atomized water particle diameter that its shower nozzle sprays is 50-100um between spray equipment 2.The present invention is suitable
In bluff body 4 and dust pond 5 are arranged on admission line 1 rear portion, so that flue gas all can skim over the water surface.
During specific design, the downward-sloping angle of admission line 1 is 5-10 °, bluff body 4 with come to flow flue gas angle be 50-
60 °, bluff body 4 lower end is about 2/3rds of admission line diameter away from dust pond water surface elevation.Specifically, when flue gas flow rate is about
During 2m/s, bluff body is about 50 ° with the angle of flue gas direction of flow, and when flue gas flow rate is about 1m/s, bluff body and flue gas are come the side of stream
To angle be about 60 °.
Some laterals are provided with equal flow tube road 20 and constitute gas pipeline 9, each gas pipeline 9 end is divided with whirlwind
Tangentially connect from device 12 inner chamber, cyclone separator 12 upper end is air outlet 18, lower end is dust removal port 3, position in cyclone separator 12
It is provided with spray water ring 17 between air outlet and gas pipeline connection position.It is provided with dust pond 5 below each cyclone separator 12,
Cyclone separator lower end dust removal port 3 stretches in dust pond 5；It is provided with the cathode line for producing electronics in each gas pipeline 9
10, when ash-laden gas flows through gas pipeline, ionized by cathode line 10 and make dust negatively charged, set in cyclone separator 12 internal face
There is anode line 16；The outside wall surface insulation of cyclone separator.Spray water ring 17 periodically sprays along cyclone separator inwall and produces moisture film,
For rinsing the dust of cyclone separator internal face collection.All atomizing sprayers 2 and spray water ring 17 all with spray Jellyfish
Pipe 6 connects.
Cathode line is arranged in outside cyclone separator by the present invention, that is, produce point electric field rather than close electric field, because whirlwind divides
From the multiformity of device internal gas flow field, if by cathode line be arranged in this will certainly so that dust to obtain electric rate not high, by cathode line cloth
Put point electric field arrangement outside in cyclone separator and then solve this problem well.Flue gas through gas pipeline negatively charged after,
On the top of cyclone separator tangentially in cyclone separator, after flue gas enters cyclone separator, powered dust is in electric field
It is captured inside cyclone separator wall in the presence of active force and inertia force.
Admission line 1, throat 11, the dust pond 5 below bluff body, equal flow tube road 20 and gas pipeline 9 are integrally machined molding
To form the flue gas transfer passage of a closing.The each equipment surface contacting with dust is all using anticorrosive, and surface is equal
Even smooth.
Described admission line air inlet 13 is horn mouth.
Equipped with water 15 in all dust ponds 5, side wall is provided with the water inlet pipe 7 with valve 19 and outlet pipe 8, is being needed with facilitating
Moisturizing and sewage effluent when wanting.
Dust pond 5 upper end below cyclone separator according to horizontal direction 10-20 upwardsoAngle draw in formed close up
14, this closing in 14 is slightly larger than cyclone separator dust removal port 3, and such structure can avoid the dust collected to overflow along opening.
All gas pipelines 9 be arranged in parallel, and parallel with the direction that flue gas initially enters the system.During actual design, defeated
Two-layer about 9 points of feed channel, every layer all arrange multiple.
The present invention relates to a kind of method and system of coal-fired flue-gas high-effective dust-removing, this system divides 3-stage dust-removal, wherein left side
Flue gas air inlet section is primary dedusting, includes the admission line of inclination, located at the atomizing sprayer of air inlet section conduit upper, big
Grain flue dust is atomized to fall after shower water catches and glides in the following current of pipeline bottom, and primary dust removing adopts inertial separation, including located at stage casing
Bluff body, bluff body forms throat diagonally downward and with the water surface in dust pond, when flue dust flows through throat, forms downward-sloping gas
Stream, the water surface that part dust impacts dust pond in the presence of inertia force and gravity is captured；Two-stage dust removal adopts electrostatic
The mode that dedusting and cyclonic separation combine, wherein electrostatic field are using a point electric field arrangement form, the pipe before cyclone separator
Cathode line is set in road, is ionized negatively charged after flue gas entrance, subsequently tangentially enters the cyclone separator located at end, whirlwind divides
Positively charged inside the wall of device, after flue gas enters cyclone separator, powered dust is in the effect of electric field action power and inertia force
Under be captured inside cyclone separator wall and move downward, shower water is set at the nearly internal face in top of cyclone separator
Ring, periodically sprays and rinses the dust of cyclone separator internal face, and prevent reentrainment of dust, and the dust rinsing enters whirlwind
The dust pond of separator bottom, clean flue gas is discharged from cyclone separator top air outlet.Efficiency of dust collection of the present invention is high, effect
Good.Present invention can apply to multiple dedusting places, using the system, coal-fired plant flue gas are processed it is ensured that discharge flue dust is down to
10mg/nm3Hereinafter, this index reaches national environmental standard.
Last it should be noted that above example is only in order to illustrate technical scheme and unrestricted, although Shen
Ask someone with reference to preferred embodiment, the present invention to be described in detail, it will be understood by those within the art that, to this
Bright technical scheme is modified or equivalent, the objective without deviating from the technical program and scope, all should cover at this
In the middle of the right of invention.
Claims (6)
1. a kind of coal-fired flue-gas high-efficiency dust removal system it is characterised in that: include smoke conveying duct, described smoke conveying duct by
End to end admission line, throat and equal flow tube road are constituted successively, and admission line is downward-sloping with airflow direction, equal flow tube road
It is inclined upwardly with airflow direction, admission line end upper tube wall is bent to form downwards and makes to flow the bluff body that flue gas streams, and enters
Under that segment pipe that feed channel end is connected with equal flow tube road tube wall downwards protuberance to be formed in pipeline and admission line and equal
The dust pond that flow tube road communicates；Bluff body lower end is located on dust pond and constitutes described throat and dust water face between；Entering
It is uniformly provided with some atomizing sprayers in feed channel；
Some laterals are provided with equal flow tube road and constitute gas pipeline, each gas pipeline end and cyclone separator inner chamber
Tangential connection, cyclone separator upper end is air outlet, and lower end is to be located at air outlet and gas pipeline in dust removal port, cyclone separator
It is provided between connection position for being washed away to inwall to collect the spray water ring of dust；It is provided with dust below cyclone separator
Pond, cyclone separator lower end dust removal port stretches in dust pond；It is provided with the cathode line for producing electronics in each gas pipeline,
When ash-laden gas flows through gas pipeline, ionized by cathode line and make dust negatively charged, be provided with anode in cyclone separator internal face
Line；The outside wall surface insulation of cyclone separator；
The downward-sloping angle of described admission line is 5-10 °, and, with come to flow flue gas angle be 50-60 °, bluff body lower end is away from collection for bluff body
Dirt pond water surface elevation is about 2/3rds of admission line diameter.
2. coal-fired flue-gas high-efficiency dust removal system according to claim 1 it is characterised in that: between described atomizing sprayer
Be spaced apart 100mm-200mm, its shower nozzle spray atomized water particle diameter be 50-100um.
3. coal-fired flue-gas high-efficiency dust removal system according to claim 1 it is characterised in that: described admission line air inlet is
Horn mouth.
4. coal-fired flue-gas high-efficiency dust removal system according to claim 1 it is characterised in that: all dust Chi Cebi are provided with
Water inlet pipe with valve and outlet pipe.
5. coal-fired flue-gas high-efficiency dust removal system according to claim 1 it is characterised in that: the dust below cyclone separator
Pond upper end according to horizontal direction 10-20 upwardsoAngle close up, this closing in be slightly larger than cyclone separator dust removal port.
6. coal-fired flue-gas high-efficiency dust removal system according to claim 1 it is characterised in that: all gas pipelines are parallel to be set
Put, and parallel with the direction that flue gas initially enters the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510174377.3A CN104801422B (en) | 2015-04-14 | 2015-04-14 | Efficient dust removal system for coal-fired flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510174377.3A CN104801422B (en) | 2015-04-14 | 2015-04-14 | Efficient dust removal system for coal-fired flue gas |
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| CN104801422A CN104801422A (en) | 2015-07-29 |
| CN104801422B true CN104801422B (en) | 2017-01-25 |
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| CN106621643A (en) * | 2015-10-29 | 2017-05-10 | 福建省庆鸿节能环保有限公司 | Acid-base dust organic exhaust gas integrated absorption (adsorption) device |
| CN105854494A (en) * | 2016-06-01 | 2016-08-17 | 广东绿由环保设备有限公司 | Flue gas processing system for process of manufacturing ceramsite with sludge |
| CN108926997A (en) * | 2018-08-06 | 2018-12-04 | 浙江欧耐斯屋面瓦业有限公司 | Exhaust treatment system and its waste gas processing method for encaustic tile production line |
| CN112933838A (en) * | 2021-02-05 | 2021-06-11 | 江苏金广恒工业设备制造有限公司 | Desulfurization and denitrification composite dedusting flue gas filtering device and filtering method thereof |
| CN113041767A (en) * | 2021-04-02 | 2021-06-29 | 刘森 | High-efficiency electro-hydraulic dust removal method and system for dust-containing flue gas |
| CN116765082A (en) * | 2022-04-01 | 2023-09-19 | 山东鲁新设计工程股份有限公司 | Dust removal system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2093312U (en) * | 1991-06-20 | 1992-01-15 | 万有容 | High-efficiency dust remover |
| CN2176840Y (en) * | 1993-12-01 | 1994-09-14 | 能源部西安热工研究所 | Rotary-air tube-like water film electrostatic duster |
| CN1268408A (en) * | 1999-03-24 | 2000-10-04 | 王连泽 | Dust-removing device with particles coagulator |
| CN2503367Y (en) * | 2001-10-14 | 2002-07-31 | 林春 | Granite wet-type five-grade desulfurization dust control device |
| CN102198369A (en) * | 2011-06-01 | 2011-09-28 | 江苏大学 | Swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus |
| CN102886189A (en) * | 2012-11-09 | 2013-01-23 | 长沙环境保护职业技术学院 | Spiral venturi scrubber and wet-method desulphurization and denitration dust-collecting system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2395771A2 (en) * | 1977-06-30 | 1979-01-26 | Rhone Poulenc Ind | PERFECTED METHOD AND DEVICE FOR WASHING AND DESICULATING GAS MIXTURES |
| WO1999044722A1 (en) * | 1998-03-02 | 1999-09-10 | Kvaerner Ships Equipment A.S | Apparatus for reducing contaminants in a pulsating exhaust gas |
-
2015
- 2015-04-14 CN CN201510174377.3A patent/CN104801422B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2093312U (en) * | 1991-06-20 | 1992-01-15 | 万有容 | High-efficiency dust remover |
| CN2176840Y (en) * | 1993-12-01 | 1994-09-14 | 能源部西安热工研究所 | Rotary-air tube-like water film electrostatic duster |
| CN1268408A (en) * | 1999-03-24 | 2000-10-04 | 王连泽 | Dust-removing device with particles coagulator |
| CN2503367Y (en) * | 2001-10-14 | 2002-07-31 | 林春 | Granite wet-type five-grade desulfurization dust control device |
| CN102198369A (en) * | 2011-06-01 | 2011-09-28 | 江苏大学 | Swirling inlet type electrostatic spraying wet flue gas desulphurization dedusting apparatus |
| CN102886189A (en) * | 2012-11-09 | 2013-01-23 | 长沙环境保护职业技术学院 | Spiral venturi scrubber and wet-method desulphurization and denitration dust-collecting system |
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| CN104801422A (en) | 2015-07-29 |
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